CN115839822B - System and method for testing process of submerged and pumping drainage of mountain tunnel induced by heavy rainfall - Google Patents
System and method for testing process of submerged and pumping drainage of mountain tunnel induced by heavy rainfall Download PDFInfo
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- CN115839822B CN115839822B CN202310165309.5A CN202310165309A CN115839822B CN 115839822 B CN115839822 B CN 115839822B CN 202310165309 A CN202310165309 A CN 202310165309A CN 115839822 B CN115839822 B CN 115839822B
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Abstract
The invention discloses a strong rainfall-induced mountain tunnel submerged and pumping process test system and method, comprising a sealed box body, wherein the top surface of the sealed box body is provided with an open end, the bottom surface of the sealed box body is fixedly connected with a foundation base, a ground stress loading device is sleeved outside the sealed box body, a surrounding rock simulation layer is arranged in the sealed box body, the bottom of the sealed box body is communicated with a drainage device, a tunnel model is arranged in the surrounding rock simulation layer in a penetrating manner, and two ends of the tunnel model are respectively communicated with two opposite side surfaces of the sealed box body; the simulation device comprises an in-hole water pressure simulation device which is arranged in the tunnel model, an out-hole water pressure simulation device is arranged in the sealing box body, the in-hole water pressure simulation device is communicated with the pumping device, and the tunnel model is provided with a data monitoring device. The invention effectively simulates the whole process of stress and damage of the tunnel lining structure under different rainfall conditions, in-hole submerging speed and in-hole pumping and draining conditions in water-rich karst areas.
Description
Technical Field
The invention relates to the technical field of tunnel engineering, in particular to a strong rainfall induced mountain tunnel flooding and pumping drainage process test system and method.
Background
The surrounding rock permeability coefficient of the water-rich karst area is larger, the influence of seasonal rainfall is obvious, and strong rainfall induces the sudden water burst, the flooding and the flood disasters to occur frequently, so that the tunnel structure bears the comprehensive effects of the inner and outer water pressure of the lining and the surrounding rock pressure. The existing tunnel structure design only considers the effect of water and soil load outside the tunnel, and the mechanical property model test of the lining structure of the existing rich water environment only considers the influence of the water load outside, so that the test research on the water flooding disaster of the pressurized water body entering the existing tunnel structure space is still in a blank stage, and the mechanical response of the lining structure under the water flooding condition is not clear. Therefore, the development of experimental research on mechanical response of the tunnel lining under the comprehensive action of surrounding rock pressure and internal and external water pressure is critical to the structural operation safety of the tunnel in the water-rich karst area.
Disclosure of Invention
The invention aims to provide a strong rainfall induced mountain tunnel flooding and pumping drainage process test system and method, which are used for solving the problems existing in the prior art.
In order to achieve the above object, the present invention provides the following solutions: the invention provides a strong rainfall induced mountain tunnel flooding and pumping drainage process test system, which comprises the following steps:
the device comprises a sealing box body, wherein the top surface of the sealing box body is provided with an open end, the bottom surface of the sealing box body is fixedly connected with a foundation base, a ground stress loading device is sleeved outside the sealing box body, a surrounding rock simulation layer is arranged in the sealing box body, the bottom of the sealing box body is communicated with a drainage device, a tunnel model is arranged in the surrounding rock simulation layer in a penetrating manner, and two ends of the tunnel model are respectively communicated with two opposite side surfaces of the sealing box body;
the simulation device comprises an in-hole water pressure simulation device, the in-hole water pressure simulation device is arranged in the tunnel model, an out-hole water pressure simulation device is arranged in the sealed box body, the in-hole water pressure simulation device is communicated with a pumping device, and a data monitoring device is arranged on the tunnel model.
Preferably, the in-hole water pressure simulation device comprises a flexible water bag, the flexible water bag is arranged in the tunnel model, a plurality of metal support rods are arranged in the flexible water bag, the metal support rods are clamped with the tunnel model, the flexible water bag is matched with the shape of the inner cavity of the tunnel model, an inner water injection hole and an inner water drainage hole are respectively formed in two ends of the flexible water bag, one end of an inner water injection pipe is communicated with the inner water injection hole, an inner water injection pump is communicated with the other end of the inner water injection pipe, and an inner water pressure gauge and an inner valve are sequentially arranged on the inner water injection pipe.
Preferably, the hole external water pressure simulation device comprises an external water injection pump, wherein the output end of the external water injection pump is communicated with the top of the sealing box body through an external water injection conduit, and an external water pressure gauge and an external valve are sequentially arranged on the external water injection conduit.
Preferably, the pumping device comprises a pumping pump, the output end and the input end of the pumping pump are respectively communicated with the inner drain hole and the water storage tank through pumping pipes, and flow speed control valves are arranged on the pumping pipes.
Preferably, the data monitoring device comprises a monitoring computer, the monitoring computer is electrically connected with a static strain acquisition instrument, a plurality of strain gauges and grating displacement sensors are correspondingly arranged on the inner wall and the outer wall of the tunnel model, a miniature soil pressure box and a miniature water pressure gauge are correspondingly embedded in the surrounding rock simulation layer outside the tunnel model, and the strain gauges, the grating displacement sensors, the miniature soil pressure box and the miniature water pressure gauge are electrically connected with the static strain acquisition instrument.
Preferably, the drainage device comprises a drainage pipe, one end of the drainage pipe is communicated with the bottom of the side face of the sealing box body, and a drainage box is arranged at the other end of the drainage pipe in a communicated mode.
Preferably, the ground stress loading device comprises a reaction frame, the reaction frame is sleeved outside the sealed box body, the bottom of the reaction frame is fixedly connected with two sides of the top surface of the foundation base, the bottom surface of the reaction frame is fixedly connected with a hydraulic pump, the output end of the hydraulic pump is fixedly connected with a vertical displacement actuator, the bottom of the vertical displacement actuator is abutted to a punching steel base plate, a pressure sensor is arranged on the vertical displacement actuator, a plurality of through holes are formed in the punching steel base plate, the bottom surface of the punching steel base plate is abutted to the top surface of the surrounding rock simulation layer, and the pressure sensor is electrically connected with a control computer.
Preferably, the surrounding rock simulation layer is prepared by mixing quartz sand, vaseline and barite powder.
Preferably, the sealing box body comprises an outer frame, the outer frame is fixedly connected to the foundation base, an organic glass panel is fixedly connected to the peripheral surface of the outer frame, reinforcing ribs are arranged on the side faces of the organic glass panel, and two ends of each reinforcing rib are fixedly connected with the outer frame respectively.
A strong rainfall-induced mountain tunnel flooding and pumping process test method comprises the following steps:
s1, sticking a strain gauge and a grating displacement sensor on a tunnel model, embedding the tunnel model after filling a surrounding rock simulation layer in a sealed box body, arranging a miniature soil pressure box and a miniature water pressure gauge at the same time, and electrically connecting the miniature soil pressure box and the miniature water pressure gauge with a static strain gauge and a detection computer;
s2, installing a ground stress loading device and a simulation device, starting a control computer for controlling the hydraulic pressure of the hydraulic pump, enabling the bottom surface of the vertical displacement actuator to be just contacted with the perforated steel plate, and applying initial water pressure and soil pressure according to the studied engineering conditions;
s3, after consolidation of the surrounding rock simulation layer is completed, water pressure and soil pressure inside and outside a tunnel model hole are adjusted in stages, so that the tunnel model is subjected to all water and soil pressure combination conditions of experimental design, and deformation and stress response of the tunnel model are recorded by utilizing a data monitoring device arranged on the tunnel model;
and S4, completely unloading the water pressure and the soil pressure, and ending the test.
The invention discloses the following technical effects: according to the invention, different tunnel burial depth conditions are simulated through the ground stress loading device, the rainfall environment is quantitatively controlled through the out-of-tunnel water pressure simulation device, and the in-tunnel water pressure value is quantitatively controlled through the in-tunnel water pressure simulation device to reproduce the change rule of the in-tunnel water pressure in the process of submerging the tunnel. The whole process of stress and damage of the tunnel lining structure under different rainfall conditions, in-hole submerging speed and in-hole pumping and draining conditions in the water-rich karst area is effectively simulated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a system and a method for testing the flooding and pumping processes of a mountain tunnel induced by heavy rainfall;
FIG. 2 is a schematic diagram of a data monitoring device according to the present invention;
FIG. 3 is a schematic diagram of a pumping device according to the present invention;
1, sealing a box body; 2. a base; 3. reinforcing ribs; 4. a surrounding rock simulation layer; 5. a tunnel model; 6. a flexible water bladder; 7. a metal support rod; 8. an inner water injection conduit; 9. an internal water injection pump; 10. an internal water pressure gauge; 11. an inner valve; 12. an external water injection pump; 13. an outer water injection conduit; 14. an external water pressure gauge; 15. an outer valve; 16. a water pump; 17. a suction and exhaust duct; 18. a water storage tank; 19. a flow rate control valve; 20. a monitoring computer; 21. a static strain acquisition instrument; 22. a strain gage; 23. a grating displacement sensor; 24. a miniature soil pressure box; 25. a miniature water pressure gauge; 26. a drain pipe; 27. a drain tank; 28. a reaction frame; 29. a hydraulic pump; 30. a vertical displacement actuator; 31. punching a steel backing plate; 32. and a control computer.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Referring to fig. 1-3, the present invention provides a strong rainfall induced mountain tunnel flooding and pumping process test system, comprising:
the device comprises a sealed box body 1, wherein the top surface of the sealed box body 1 is provided with an open end, a foundation base 2 is fixedly connected to the bottom surface of the sealed box body 1, a ground stress loading device is sleeved outside the sealed box body 1, a surrounding rock simulation layer 4 is arranged in the sealed box body 1, the bottom of the sealed box body 1 is communicated with a drainage device, a tunnel model 5 is arranged in the surrounding rock simulation layer 4 in a penetrating manner, and two ends of the tunnel model 5 are respectively communicated with two opposite side surfaces of the sealed box body 1;
the simulation device comprises an in-hole water pressure simulation device which is arranged in the tunnel model 5, an out-hole water pressure simulation device is arranged in the sealed box body 1, the in-hole water pressure simulation device is communicated with a pumping device, and a data monitoring device is arranged on the tunnel model 5.
Further optimizing scheme, the in-hole water pressure analog device comprises a flexible water bag 6, the flexible water bag 6 is arranged in the tunnel model 5, a plurality of metal support rods 7 are arranged in the flexible water bag 6, the metal support rods 7 and the tunnel model 5 clamp the flexible water bag 6, the flexible water bag 6 is matched with the shape of the inner cavity of the tunnel model 5, two ends of the flexible water bag 6 are respectively provided with an inner water injection hole and an inner water drainage hole, one end of an inner water injection guide pipe 8 is communicated with the inner water injection hole, an inner water injection pump 9 is communicated with the other end of the inner water injection guide pipe 8, and an inner water pressure gauge 10 and an inner valve 11 are sequentially arranged on the inner water injection guide pipe 8.
The flexible water bag 6 is arranged in the tunnel model 5, and the same section shape as the tunnel model 5 is adopted, so that the side face of the flexible water bag 6 is tightly attached to the inner wall of the tunnel model 5 after water filling, and the flexible water bag 6 is positioned in advance through the metal support rods 7. The middle position of the rear end of the front section of the flexible water bag 6 is respectively provided with an inner water injection hole and an inner water drainage hole. The water injection hole in the front end of the water sac is connected with an inner water injection pump 9 and an inner water pressure meter 10 through an inner water injection pipe 8, the water pressure in the tunnel hole is regulated by controlling the inner water injection pump 9, and the phenomenon of water pressure rise in the tunnel hole in the process of submerged tunnel with heavy rainfall is simulated.
Further optimizing scheme, hole outer water pressure analogue means includes outer water injection pump 12, and the output of outer water injection pump 12 passes through outer water injection pipe 13 and the intercommunication of sealed box 1 top and sets up, has set gradually outer water pressure gauge 14 and outer valve 15 on the outer water injection pipe 13.
The external water pressure of the existing tunnel structure formed by short-time heavy rainfall can be simulated by continuously injecting water into the closed test box by using the external water injection pump 12, and the magnitude of the external water pressure of the tunnel model 5 is controlled by the external water pressure gauge 14 in the water injection process.
Further optimizing scheme, the pumping device includes suction pump 16, and suction pump 16 output and input are provided with flow rate control valve 19 through pumping pipe 17 and interior wash port and water storage tank 18 intercommunication respectively. The pumping process of the water body in the submerged tunnel is simulated by controlling the pumping speed, and the water body is pumped out and discharged into the water storage tank 18.
Further optimizing scheme, the data monitoring device includes monitoring computer 20, and monitoring computer 20 electric connection has static strain collection appearance 21, corresponds on the inner wall and the outer wall of tunnel model 5 to be provided with a plurality of foil gage 22 and grating displacement sensor 23, and the surrounding rock analog layer 4 outside the tunnel model 5 is equipped with miniature soil pressure cell 24 and miniature water pressure gauge 25 in correspondence, and foil gage 22, grating displacement sensor 23, miniature soil pressure cell 24 and miniature water pressure gauge 25 all with static strain collection appearance 21 electric connection.
Strain gauges 22 and grating displacement sensors 23 are stuck on the inner and outer surfaces of the tunnel model 5, and a miniature soil pressure box 24 and a miniature water pressure gauge are embedded in a surrounding rock simulation layer 4 at a preset position around the tunnel model 5. The strain gauge 22, the grating displacement sensor 23, the miniature water pressure gauge and the miniature soil pressure box 24 are respectively connected with the static strain gauge and the input end of the computer through transmission lines to realize the dynamic measurement of the whole process of the mechanical response of the tunnel model 5.
Further optimizing scheme, drainage device includes drain pipe 26, and drain pipe 26's one end and the side bottom intercommunication setting of seal box 1, drain pipe 26 other end intercommunication are provided with drain box 27.
Further optimizing scheme, the ground stress loading device includes reaction frame 28, and reaction frame 28 cover is established in the outside of sealed box 1, and the bottom of reaction frame 28 and basic base 2 top surface both sides rigid coupling, and the bottom surface rigid coupling of reaction frame 28 has hydraulic pump 29, and the output rigid coupling of hydraulic pump 29 has vertical displacement actuator 30, and vertical displacement actuator 30 bottom butt has steel backing plate 31 that punches, is provided with pressure sensor on the vertical displacement actuator 30, has seted up a plurality of through-holes on the steel backing plate 31 that punches, and the bottom surface of steel backing plate 31 that punches and the 4 top surface butt of surrounding rock analog layer of layer, pressure sensor and hydraulic pump 29 electric connection have control computer 32.
The bottom of the reaction frame 28 is welded on the steel foundation base 2, and a hydraulic pump 29 and a vertical displacement actuator and a perforated steel backing plate 31 are sequentially arranged below the reaction frame 28; the hydraulic pump 29 is controlled by the control computer 32 to apply pressure on the perforated steel plate, acting force can be evenly transmitted to the lower surrounding rock simulation layer 4 to simulate stratum stress at the top of the tunnel model 5, and meanwhile, reserved holes in the perforated steel backing plate 31 can be used for providing external water pressure of the tunnel.
In a further optimized scheme, the surrounding rock simulation layer 4 is prepared by mixing quartz sand, vaseline and barite powder.
Further optimizing scheme, sealed box 1 includes outer frame, outer frame rigid coupling on basic base 2, and the global rigid coupling of outer frame has organic glass panel, and organic glass panel side is provided with stiffening rib 3, and stiffening rib 3's both ends respectively with outer frame rigid coupling.
The outer frame is mainly formed by welding channel steel and angle steel, the tunnel model 5 is a hollow cylinder, the tunnel model is prepared by mixing and pouring water and gypsum according to a proportion, and physical parameters of the tunnel model 5 and the surrounding rock simulation layer 4 can be obtained through calculation according to research objects and similar theories.
The outer frame that sets up welds on steel basic base 2, and sealed box 1 front and back side is equipped with tunnel model 5 import and export respectively, provides the space for the interior water pressure molding device of hole, and both ends import all sets up fixing device constraint water pocket deformation around. The upper part of the closed box body is provided with a detachable movable baffle for filling the surrounding rock simulation layer 4, and the middle part of the movable baffle is provided with a preformed hole of a vertical displacement actuator.
According to the invention, surrounding rock similar materials are filled in a model test box, and a tunnel model 5 is buried in a preset position of a stable surrounding rock simulation layer 4. After the model box is filled, the height of the water tank is adjusted according to the preset water head height, and the outside water pressure of the existing tunnel structure formed by short-time heavy rainfall is simulated. And after the external water pressure reaches a preset value, the test system is kept in a stable state. And then, adjusting the water pressure in the tunnel by controlling the in-tunnel water pressure simulation device and further adjusting the in-tunnel water pressure simulation device, and simulating the phenomenon of increasing the water pressure in the tunnel formed by flooding the tunnel with strong rainfall in a short time. And finally, simulating the pumping process by controlling the water discharge amount of the pumping device. In the whole process of loading and pumping out the water pressure outside and inside the tunnel, the data detection device is arranged outside the test model box to realize the real-time measurement of mechanical performances such as stress, deformation and the like of the tunnel model 5.
By setting different tunnel hole external water head heights, hole internal water head heights and pumping speed, the deformation, stress and destruction rules of the existing tunnel structure under different working conditions can be obtained by repeating the steps. Compared with the prior art, the invention has the beneficial effects that: the experimental device realizes independent control of the water pressure in and outside the tunnel in the experiment, and can reproduce the water and soil load condition under the condition of heavy rainfall induced tunnel flooding.
A strong rainfall-induced mountain tunnel flooding and pumping process test method comprises the following steps:
s1, sticking a strain gauge 22 and a grating displacement sensor 23 on a tunnel model 5, filling a surrounding rock simulation layer 4 into a sealed box body 1, burying the tunnel model 5, arranging a miniature soil pressure box 24 and a miniature water pressure gauge 25 at the same time, and electrically connecting the miniature soil pressure box 24 and the miniature water pressure gauge with a static strain gauge and a detection machine;
a tunnel model 5 is manufactured aiming at the researched engineering object, and a strain gauge 22 and a grating displacement sensor 23 are stuck on the tunnel model 5; and then, configuring surrounding rock similar materials, paving and compacting the simulated stratum materials layer by layer in the box body according to the preset compactness to form a surrounding rock simulated layer 4. When a predetermined height is reached, the tunnel model 5 is buried inside the surrounding rock simulation layer 4. And meanwhile, the data detection device is installed and watertight is carried out.
S2, installing a ground stress loading device and a simulation device, simultaneously starting a control computer 32 for controlling the hydraulic pressure of the hydraulic pump 29, enabling the bottom surface of the vertical displacement actuator to be just contacted with the perforated steel plate, and applying initial water pressure and soil pressure according to the studied engineering conditions;
after the surrounding rock similar materials are filled, a punching steel plate, a vertical displacement actuator and a hydraulic pump 29 are sequentially arranged upwards from the top of the soil body, the top of the hydraulic pump 29 is contacted with a reaction frame 28, and the punching steel plate is contacted with the top surface of the soil body. Finally, the junction between the hydraulic pump 29 and the top plate of the test chamber is sealed, and the test chamber is assembled. The control computer 32 is started to enable the bottom surface of the vertical displacement actuator to be just contacted with the perforated steel plate. Finally, the initial water pressure and the soil pressure are applied to the tunnel model 5 test box according to the studied engineering conditions.
S3, after the surrounding rock simulation layer 4 is solidified, the water pressure and the soil pressure in and out of the tunnel model 5 are adjusted in stages, so that the tunnel model 5 is subjected to all water and soil pressure combination conditions of experimental design, and the deformation and stress response of the tunnel model 5 are recorded by utilizing a data monitoring device arranged on the tunnel model 5;
and S4, completely unloading the water pressure and the soil pressure, and ending the test.
In the description of the present invention, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (9)
1. The utility model provides a rainfall on intensity induces mountain tunnel submerging and drainage process test system which characterized in that includes:
the device comprises a sealing box body (1), wherein the top surface of the sealing box body (1) is provided with an open end, a foundation base (2) is fixedly connected to the bottom surface of the sealing box body (1), a ground stress loading device is sleeved outside the sealing box body (1), a surrounding rock simulation layer (4) is arranged in the sealing box body (1), a drainage device is arranged at the bottom of the sealing box body (1) in a communicating manner, a tunnel model (5) is arranged in the surrounding rock simulation layer (4) in a penetrating manner, and two ends of the tunnel model (5) are respectively arranged at two opposite side surfaces of the sealing box body (1) in a communicating manner;
the simulation device comprises an in-hole water pressure simulation device, the in-hole water pressure simulation device is arranged in the tunnel model (5), an out-hole water pressure simulation device is arranged in the sealing box body (1), the in-hole water pressure simulation device is communicated with a pumping device, and a data monitoring device is arranged on the tunnel model (5);
the device is characterized in that the intra-hole water pressure simulation device comprises a flexible water bag (6), the flexible water bag (6) is arranged in the tunnel model (5), a plurality of metal support rods (7) are arranged in the flexible water bag (6), the metal support rods (7) are clamped with the tunnel model (5) by the aid of the flexible water bag (6), the shape of the inner cavity of the tunnel model (5) is matched with that of the inner cavity of the tunnel model (5), two ends of the flexible water bag (6) are respectively provided with an inner water injection hole and an inner water discharge hole, one end of an inner water injection guide pipe (8) is communicated with the inner water injection hole, an inner water injection pump (9) is communicated with the other end of the inner water injection guide pipe (8), and an inner water pressure gauge (10) and an inner valve (11) are sequentially arranged on the inner water injection guide pipe (8).
2. The heavy rainfall induced mountain tunnel flooding and pumping process test system as claimed in claim 1, wherein: the hole external water pressure simulation device comprises an external water injection pump (12), wherein the output end of the external water injection pump (12) is communicated with the top of the sealing box body (1) through an external water injection guide pipe (13), and an external water pressure gauge (14) and an external valve (15) are sequentially arranged on the external water injection guide pipe (13).
3. The heavy rainfall induced mountain tunnel flooding and pumping process test system as claimed in claim 2, wherein: the pumping device comprises a water pump (16), the output end and the input end of the water pump (16) are respectively communicated with the inner drain hole and the water storage tank (18) through a pumping and draining pipe (17), and a flow speed control valve (19) is arranged on the pumping and draining pipe (17).
4. A heavy rainfall induced mountain tunnel flooding and drainage process test system as claimed in claim 3, wherein: the data monitoring device comprises a monitoring computer (20), the monitoring computer (20) is electrically connected with a static strain acquisition instrument (21), a plurality of strain gauges (22) and grating displacement sensors (23) are correspondingly arranged on the inner wall and the outer wall of a tunnel model (5), a miniature soil pressure box (24) and a miniature water pressure gauge (25) are correspondingly embedded in a surrounding rock simulation layer (4) outside the tunnel model (5), and the strain gauges (22), the grating displacement sensors (23), the miniature soil pressure box (24) and the miniature water pressure gauge (25) are electrically connected with the static strain acquisition instrument (21).
5. The strong rainfall induced mountain tunnel flooding and pumping drainage process test system as claimed in claim 4, wherein: the drainage device comprises a drainage pipe (26), one end of the drainage pipe (26) is communicated with the bottom of the side face of the sealing box body (1), and a drainage box (27) is arranged at the other end of the drainage pipe (26) in a communicated mode.
6. The heavy rainfall induced mountain tunnel flooding and pumping drainage process test system as claimed in claim 5 and wherein: the ground stress loading device comprises a counterforce frame (28), the counterforce frame (28) is sleeved outside the sealed box body (1), the bottom of the counterforce frame (28) is fixedly connected with two sides of the top surface of the foundation base (2), a hydraulic pump (29) is fixedly connected to the bottom surface of the counterforce frame (28), a vertical displacement actuator (30) is fixedly connected to the output end of the hydraulic pump (29), a punching steel base plate (31) is abutted to the bottom of the vertical displacement actuator (30), a pressure sensor is arranged on the vertical displacement actuator (30), a plurality of through holes are formed in the punching steel base plate (31), the bottom surface of the punching steel base plate (31) is abutted to the top surface of the surrounding rock simulation layer (4), and a control computer (32) is electrically connected to the pressure sensor and the hydraulic pump (29).
7. The heavy rainfall induced mountain tunnel flooding and pumping drainage process test system as claimed in claim 6, wherein: the surrounding rock simulation layer (4) is prepared by mixing quartz sand, vaseline and barite powder.
8. The heavy rainfall induced mountain tunnel flooding and pumping drainage process test system as claimed in claim 7, wherein: the sealing box body (1) comprises an outer frame, the outer frame is fixedly connected to the base (2), an organic glass panel is fixedly connected to the peripheral surface of the outer frame, reinforcing ribs (3) are arranged on the side face of the organic glass panel, and two ends of the reinforcing ribs (3) are fixedly connected with the outer frame respectively.
9. A method for testing the process of flooding and pumping drainage of a mountain tunnel with heavy rainfall induction, according to claim 8, comprising the following steps:
s1, sticking a strain gauge (22) and a grating displacement sensor (23) on a tunnel model (5), filling a surrounding rock simulation layer (4) into a sealed box body (1), burying the tunnel model (5), arranging a miniature soil pressure box (24) and a miniature water pressure gauge (25), and electrically connecting the miniature soil pressure box with a static strain gauge and a detection machine;
s2, installing a ground stress loading device and a simulation device, simultaneously starting a control computer (32) for controlling the hydraulic pressure of a hydraulic pump (29) to enable the bottom surface of the vertical displacement actuator to be just contacted with a perforated steel plate, and applying initial hydraulic pressure and soil pressure according to the studied engineering condition;
s3, after the surrounding rock simulation layer (4) is solidified, the water pressure and the soil pressure in and out of the tunnel model (5) are adjusted in stages, so that the tunnel model (5) is subjected to all water and soil pressure combination conditions of experimental design, and the deformation and stress response of the tunnel model (5) are recorded by utilizing a data monitoring device arranged on the tunnel model (5);
and S4, completely unloading the water pressure and the soil pressure, and ending the test.
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| CN116990144B (en) * | 2023-09-27 | 2023-12-15 | 交通运输部公路科学研究所 | Test method and system for mechanical response of local water softening surrounding rock tunnel lining |
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| CN111965031A (en) * | 2020-09-21 | 2020-11-20 | 长沙学院 | Tunnel lining and surrounding rock mechanical characteristic test model device and test method |
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| CN114839126A (en) * | 2022-04-08 | 2022-08-02 | 浙江交投高速公路建设管理有限公司 | Test device for simulating and testing back water pressure of karst tunnel |
| CN115508118A (en) * | 2022-09-19 | 2022-12-23 | 长安大学 | Water gushing and water bursting test system for water-rich tunnel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111965031A (en) * | 2020-09-21 | 2020-11-20 | 长沙学院 | Tunnel lining and surrounding rock mechanical characteristic test model device and test method |
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